The person in charge of all certification matters is Mr. Claudio Cervelli. You can expose him your problem by sending an e-mail at his address firstname.lastname@example.org. You must be the most precise and detailed as possible, also by specifying the order number or the valves serial numbers. If you are talking about the ISPESL test certificates, please notice that the original one is the one you had. We can anyway issue a copy of it (non original) for free.
Consider as well that for obsolete valves we cannot issue a new certificate or a copy of it, but you must take into consideration to maintain the valves or to buy a new ones.
For other kinds of certificates, such as flow rate certificates, we will require an extra cost of 50 Euros.